Oxygen
Oxygen is the gas that passes from the lungs to the bloodstream.
The gas that passes from the bloodstream into the lungs is called carbon dioxide. Carbon dioxide is transported from the tissues to the lungs via the bloodstream, where it is exhaled out of the body during respiration.
oxygen
Oxygen passes through the nasal cavity, pharynx, trachea, bronchi, bronchioles, and finally reaches the alveoli in the lungs where gas exchange occurs with the bloodstream.
When air passes through the respiratory system, it travels through the nose or mouth, down the trachea (windpipe), and into the lungs where gas exchange occurs. Oxygen from the air is absorbed into the bloodstream, and carbon dioxide is released from the bloodstream into the air to be exhaled.
Oxygen is the gas that usually passes into cells. It moves by diffusion from the bloodstream.
Alveoli are tiny air sacs in the lungs where gas exchange takes place. Oxygen from the air we breathe passes into the bloodstream, while carbon dioxide from the bloodstream is released into the alveoli to be exhaled.
Lungs
Gas exchange occurs in the alveoli of the lungs, where oxygen from the inhaled air passes into the bloodstream, and carbon dioxide from the blood is expelled into the alveoli to be exhaled. The oxygen is then transported by red blood cells to tissues and organs throughout the body, where it is used for cellular respiration to produce energy. Carbon dioxide, a byproduct of this process, is carried back to the lungs for removal.
carbon dioxide
The alveoli are small air sacs located at the end of the bronchioles in the lungs. They are responsible for gas exchange, where oxygen from the air is absorbed into the bloodstream and carbon dioxide is released from the bloodstream into the lungs to be exhaled.
Carbon dioxide is produced as a waste product of respiration, and is taken in the bloodstream to the capillaries outside the lungs, where the CO2 diffuses into the alveoli of the lungs.